undulatory property

例句：

1. 1. The material is undulatory, allowing for easy stretching.
   这种材料具有弹性，便于拉伸。
2. 2. The rope is undulatory, making it easy to adjust the length.
   绳子是可伸缩的，易于调整长度。
3. 3. The design of this window is undulatory, providing ample space for movement.
   这个窗户的设计是可伸缩的，为活动提供了充足的空间。